Update README.md

Author: Vittorio Vittori

README.md

@@ -60,10 +60,10 @@ Base usage example:
 </html>
 ```
 
-To test it on Mac OSX use this command in the root folder:
+To test it on Mac OSX run this command in the root folder:
 
 ```
-php -S localhost:8000 -t ./
+npm install && ./node_modules/.bin/bower install && php -S localhost:8000 -t ./
 ```
 
 Then, in the browser go to: